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/* SPDX-License-Identifier: GPL-2.0 */
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#ifndef __ASM_CSKY_BARRIER_H
#define __ASM_CSKY_BARRIER_H
#ifndef __ASSEMBLY__
#define nop() asm volatile ("nop\n":::"memory")
#ifdef CONFIG_SMP
/*
* bar.brwarws: ordering barrier for all load/store instructions
* before/after
*
* |31|30 26|25 21|20 16|15 10|9 5|4 0|
* 1 10000 00000 00000 100001 00001 0 bw br aw ar
*
* b: before
* a: after
* r: read
* w: write
*
* Here are all combinations:
*
* bar.brw
* bar.br
* bar.bw
* bar.arw
* bar.ar
* bar.aw
* bar.brwarw
* bar.brarw
* bar.bwarw
* bar.brwar
* bar.brwaw
* bar.brar
* bar.bwaw
*/
#define __bar_brw() asm volatile (".long 0x842cc000\n":::"memory")
#define __bar_br() asm volatile (".long 0x8424c000\n":::"memory")
#define __bar_bw() asm volatile (".long 0x8428c000\n":::"memory")
#define __bar_arw() asm volatile (".long 0x8423c000\n":::"memory")
#define __bar_ar() asm volatile (".long 0x8421c000\n":::"memory")
#define __bar_aw() asm volatile (".long 0x8422c000\n":::"memory")
#define __bar_brwarw() asm volatile (".long 0x842fc000\n":::"memory")
#define __bar_brarw() asm volatile (".long 0x8427c000\n":::"memory")
#define __bar_bwarw() asm volatile (".long 0x842bc000\n":::"memory")
#define __bar_brwar() asm volatile (".long 0x842dc000\n":::"memory")
#define __bar_brwaw() asm volatile (".long 0x842ec000\n":::"memory")
#define __bar_brar() asm volatile (".long 0x8425c000\n":::"memory")
#define __bar_brar() asm volatile (".long 0x8425c000\n":::"memory")
#define __bar_bwaw() asm volatile (".long 0x842ac000\n":::"memory")
#define __smp_mb() __bar_brwarw()
#define __smp_rmb() __bar_brar()
#define __smp_wmb() __bar_bwaw()
#define ACQUIRE_FENCE ".long 0x8427c000\n"
#define __smp_acquire_fence() __bar_brarw()
#define __smp_release_fence() __bar_brwaw()
#endif /* CONFIG_SMP */
/*
* sync: completion barrier, all sync.xx instructions
* guarantee the last response recieved by bus transaction
* made by ld/st instructions before sync.s
* sync.s: inherit from sync, but also shareable to other cores
* sync.i: inherit from sync, but also flush cpu pipeline
* sync.is: the same with sync.i + sync.s
*/
#define mb() asm volatile ("sync\n":::"memory")
#ifdef CONFIG_CPU_HAS_CACHEV2
/*
* Using three sync.is to prevent speculative PTW
*/
#define sync_is() asm volatile ("sync.is\nsync.is\nsync.is\n":::"memory")
#endif
#include <asm-generic/barrier.h>
#endif /* __ASSEMBLY__ */
#endif /* __ASM_CSKY_BARRIER_H */
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